firs_css.css

.bg{
    position: absolute;
    background-image: url("https://jolly-kalam-23776e.netlify.app/restaurantwebsite/assets/images/topography.svg");
    background-position:center ;
    background-repeat: no-repeat;
    background-size: cover;
    height: 100%;
    width: 100%;
    z-index: -1;
    opacity: 0.7;
}
.btn1{
    background: #fff; 
    color:#333;
    cursor: pointer;
    border: 1px solid;
    padding: 1em;
}
.btn1:hover{
    background: yellowgreen;
    color: wheat;
}